<!DOCTYPE HTML>
<html>
<head>
    <link href="custom-select.css" rel="stylesheet" type="text/css" />
    <link href="style.css" rel="stylesheet">
</head>
<body>
    <script src="jquery.min.js"></script>
    <script src="custom-select.min.js" type="text/javascript"></script>
    <script>
    jQuery(document).ready(function() {
        $(".select2").select2();
        $('.selectpicker').selectpicker();
    });
    </script>
    <div class="row">
        <div class="col-sm-12">
            <div class="white-box">
                <select class="form-control select2">
                    <option>中国</option>
                    <option>美国</option>
                    <option>泰国</option>
                    <option>英国</option>
                    <option>法国</option>
                    <option>日本</option>
                    <option>日本</option>
                    <option>日本</option>
                    <option>日本</option>
                </select>
            </div>
        </div>
    </div>